Accession Number : ADA305026

Title :   Study of Advanced Composite Structural Design Concepts for an Arrow Wing Supersonic Cruise Configuration.

Descriptive Note : Final rept.

Corporate Author : BOEING COMMERCIAL AIRPLANE CO SEATTLE WA

PDF Url : ADA305026

Report Date : JAN 1978

Pagination or Media Count : 473

Abstract : A structural design study was conducted to assess the relative merits of structural concepts using advanced composite materials for an advanced supersonic aircraft cruising at Mach 2.7. The configuration and structural arrangement developed during Task I and II of the study, previously reported in NASA CR-132576, was used as the baseline configuration. Allowable stresses and strains were established for boron and advanced graphite fibers based on projected fiber properties available in the next decade. Structural concepts were designed and analyzed using graphite polyimide and boron polyimide, applied to stiffened panels and conventional sandwich panels. The conventional sandwich panels were selected as the structural concept to be used on the wing structure. The upper and lower surface panels of the Task I arrow wing were redesigned using high-strength graphite polyimide sandwich panels over the titanium spars and ribs. The ATLAS computer system was used as the basis for stress analysis and resizing the surface panels using the loads from the Task II study, without adjustment for change in aeroelastic deformation. The flutter analysis indicated a decrease in the flutter speed compared to the baseline titanium wing design. The flutter speed was increased to that of the titanium wing, with a weight penalty less than that of the metallic airplane.

Descriptors :   *LAMINATES, *AEROELASTICITY, *POLYIMIDE PLASTICS, *SUPERSONIC AIRCRAFT, STRESS STRAIN RELATIONS, MATHEMATICAL MODELS, AIRCRAFT, STRESS ANALYSIS, COMPOSITE MATERIALS, AERODYNAMIC STABILITY, FINITE ELEMENT ANALYSIS, STRUCTURAL ANALYSIS, DEFORMATION, FIBER REINFORCED COMPOSITES, MODULUS OF ELASTICITY, GRAPHITE, CARBON FIBERS, STRENGTH(MECHANICS), HIGH STRENGTH, TITANIUM, MACH NUMBER, DESIGN CRITERIA, WINGS, BORON, AERODYNAMIC HEATING, FLUTTER, POISSON RATIO, SANDWICH PANELS, AERODYNAMIC CONTROL SURFACES, POLYIMIDE RESINS.

Subject Categories : Aerodynamics
      Research and Experimental Aircraft
      Laminates and Composite Materials
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE